Besides stars, the United States Navy uses quasars as beacons. Quasars are distant galaxies with supermassive black holes, surrounded by ... X-Ray Flashes from a Nearby Supermassive Black Hole ...

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If you buy something, we may earn an affiliate commission. Anytime I think about the best white dress shirts for men, I start daydreaming about Don Draper pulling a crisp 5-pack out of his desk ...